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PES SS 1 Chemistry 3rd Term Exam 2024-2025
  • 1. What type of reaction does the following equation represent? H3O+ OH- --> 2H2O
A) reduction
B) neutralisation
C) oxidation
D) hydrolysis
Chemistry
  • 2. The oxidation number of Y the formula above is ____
A) +7
B) +6
C) -7
D) -6
  • 3. Which statement best describes the process of reduction?
A) addition of oxygen
B) increase in oxidation number
C) removal of electrons
D) addition of hydrogen
Chemistry
  • 4. The oxidation number of Z the formula above is ____
A) -2
B) -4
C) +2
D) +4
  • 5. What is the oxidation number of Manganese in KMnO4?
A) +7
B) -6
C) +6
D) -7
  • 6. Name this compound. KMnO4
A) Potassium hexaoxomanganate (IV)
B) Potassium tetraoxomanganate (VII)
C) Potassium tetraoxomanganate (V)
D) Potassium hexaoxomanganate (VI)
  • 7. What is the oxidation number of Chromium in K2Cr2O7?
A) +6
B) +7
C) -7
D) -6
  • 8. What is the oxidation number of S in SO4-2?
A) +6
B) +8
C) -6
D) -8
  • 9. Which of the following is not a transition metal?
A) Cu
B) Na
C) Ag
D) Fe
  • 10. Which of the following is not an alkali metal?
A) Li
B) Na
C) Mg
D) K
  • 11. What is the chemical formula of Sodium chloride?
A) Na2Cl
B) SCl
C) SCl2
D) NaCl
  • 12. Which of the following indicates oxidation?
A) Addition of hydrogen
B) Addition of electrons
C) Removal of electrons
D) Removal of Oxygen
  • 13. Which of the following does not indicate reduction?
A) Addition of hydrogen
B) Removal of electrons
C) Addition of electrons
D) Removal of Oxygen
Chemistry
  • 14. What does x represent?
A) +5
B) +3
C) -3
D) -1
  • 15. What type of reaction is represented here? AB +CD --> AD + CB
A) Catalytic
B) Displacement
C) Double decomposition
D) Thermal dissociation
  • 16. What is the name of this compound? HNO3
A) Trioxonitrate (III) acid
B) Trioxonitrate (IV) acid
C) Trioxonitrate (V) acid
D) Trioxonitrate (VI) acid
  • 17. Neutralization is the reaction between ________ and ___________
A) an acid and a base
B) a salt and water
C) an acid and a salt
D) a base and a salt
  • 18. Ammonium Chloride is written as __________
A) (NH4)_2Cl
B) NH4Cl2
C) NH4Cl
D) (NH4)_2Cl2
  • 19. Which element has the atomic number 7?
A) Oxygen
B) Carbon
C) Fluorine
D) Nitrogen
  • 20. Which of the following is the correct way to write Aluminium trioxocarbonate (IV)?
A) Al3(CO3)_2
B) Al(CO3)
C) Al2(CO3)_3
D) Al(CO3)_3
  • 21. At constant volume, the pressure of a gas is directly proportional to the temperature in Kelvin. This is the statement of _________
A) Charles' Law
B) Boyle's Law
C) Avogadro's Law
D) Gay-Lusaac's Law
  • 22. What are amphoteric oxides?
A) Non-metallic oxides that exhibit both acidic and basic properties
B) Non-metallic oxides that exhibit both physical and chemical properties
C) Metallic oxides that exhibit both acidic and basic properties
D) Metallic oxides that exhibit both physical and chemical properties
  • 23. Which of the following is the correct way to write Potassium trioxonitrate (V)?
A) K(NO3)_2
B) K2NO3
C) KNO3
D) K2(NO3)_3
  • 24. Which of the following is not an alkaline earth metal?
A) Mg
B) Ca
C) Na
D) Be
Chemistry
  • 25. Which of the following is oxidation?
A) a
B) d
C) c
D) b
Chemistry
  • 26. Which of the following is reduction?
A) d
B) c
C) a
D) b
Chemistry
  • 27. The reaction shown here is an example of ____________
A) Displacement
B) Combination
C) Thermal dissociation
D) Decomposition
Chemistry
  • 28. The reaction shown here is an example of ____________
A) Combination
B) Displacement
C) Decomposition
D) Catalytic
  • 29. The chemical symbol of Sodium is ___
  • 30. The chemical symbol of Potassium is ___
  • 31. The chemical symbol of Magnesium is ___
  • 32. The chemical symbol of Nitrogen is ___
  • 33. The chemical symbol of Copper is ___
  • 34. The chemical symbol of Manganese is ___
  • 35. The chemical symbol of Iron is ___
  • 36. The existence in the same physical state of two or more structural forms of the same element is known as ____
A) eclipse
B) isotopy
C) allotropy
D) hybridization
  • 37. Which groups are known as halogens?
A) group 9
B) group 7
C) group 8
D) group 5
  • 38. Calculate the molar mass of Potassium chloride (k=39, Cl=35.5)
A) 74.5gmol-1
B) 58.5gmol-1
C) 47gmol-1
D) 74gmol-1
  • 39. _____is a process of preventing iron from rusting by protecting it with other metals like copper, tin, gold and silver
A) Electroplating
B) Greasing
C) Painting
D) Oiling
  • 40. The symbol of silver is written as
A) Si
B) Au
C) Ag
D) Al
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